EMPTY collection predicate

 

EMPTY collection predicate

To test if a multivalued relationship is empty, use the following syntax:
collection-valued-path-expression  IS [NOT]  EMPTY

Example: Empty collection predicate

To find all departments with no employees:

SELECT OBJECT(d) FROM DeptBean d  WHERE  d.emps IS EMPTY



Related concepts
EJB query language
WHERE clause

Related tasks
Using EJB query